I'll leave the article I found for you to read.
Large Hadron ColliderBasically, if this thing is started and everything goes as planned, then there are a few outcomes:
1. Quarks are created, which change all matter that they touch into quarks, "eating" all matter they come in contact with.
2. A micro black hole is created, Which will, you guessed it, EAT MATTER.
3. God Particles are created, and the answer to life, the universe, and everything is found. The world will probably destroy itself soon after, just for spite.
What do you think about this? Should the LHC be left unused, or should mankind risk destruction for knowledge?